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Mechanisms of Resistance to the Cassava Green Mite Mononychellus tanajoa (Bondar) on Pubescent and Non-Pubescent Cassava Varieties

Published online by Cambridge University Press:  19 September 2011

Masamba Walangululu ,
Ki Munseki Lema  and
Nlandu Nsumbu
Masamba Walangululu
Affiliation:
Institut Facultaire des Sciences Agronomiques (IFA), B.P. 1232 Kisangani (Province Orientale), République Démocratique du Congo
Ki Munseki Lema
Affiliation:
International Institute of Tropical Agriculture (IITA), PMB 5320 Oyo Road, Ibadan, Nigeria
Nlandu Nsumbu
Affiliation:
Institut Facultaire des Sciences Agronomiques (IFA), B.P. 1232 Kisangani (Province Orientale), République Démocratique du Congo
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Abstract

Cassava varieties resistant to the cassava green mite, Mononychellus tanajoa (Bondar) ( Acari:Tetranychidae) have been reported in many parts of Africa where the pest has been introduced. However, the resistance mechanisms have not been identified. Laboratory studies on biology and feeding behaviour of cassava green mite were carried out at the International Institute of Tropical Agriculture (IITA), in order to determine whether this resistance is mainly due to pubescence.

Cassava pubescence was found to have no antibiotic effect; both pubescent and non-pubescent varieties were preferred by the mite for oviposition, food and shelter. In addition, pubescence does not afford a mechanical barrier to cassava against green mite infestation.

Résumé

Les variétés résistantes de manioc aux attaques d'acarien vert ont été observées dans beaucoup de pays d'Afrique où sévit cette peste mais les mécanismes de résistance n'ont pas encore été identifiés. Des études ont été menées au laboratoire à l'Institut International d'Agriculture Tropicale (IITA) sur la biologie et le comportement pendant la prise de nourriture de l'acarien vert en vue de confirmer si la pubescence est la cause principale de cette résistance, comme cela a souvent été affirmé à l'IITA.

Les résultats ont montré que les variétés pubescentes ne manifestent pas d'antibiose. Aussi bien les variétés pubescentes que non-pubescentes sont préférées pour la ponte, la nourriture et l'abri, indiquant qu'il n'y a pas de préférence pour l'une ou l'autre variété. En plus les poils n'empêchent pas l'acarien de se nourrir Sur les feuilles.

Keywords

resistancegreen miteMononychellus tanajoacassavapubescenceantibiosisantixenosisbiologyfeeding behaviourrésistanceacarien vertMononyehellus tanajoamaniocpubescenceantibioseantixénosebiologiecomportement pendant l'alimentation
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 18 , Issue 4 , December 1998 , pp. 285 - 291
Copyright
Copyright © ICIPE 1998

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References

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